sitting duck

名词 sitting duck:

1. a defenseless victim
   同义词：easy mark

1. The president's comment on taxes make him a sit duck to critic.
   总统对税收的意见使他成为众矢之的。
2. Without my gun, I'm a sitting duck for any terrorist.
   没有这支枪，我就成了恐怖分子下手的目标。